Latch for griwding-mills



E. F. McCOO'L.

LATCH FOR GRINDING MILLS.

APPLICATION FILED JUNE 4. 1913.

Paten ted Nov. 11, 1919.

EDWARD F. MoCOOL, 0F VICTOR, COLORADO.

LATCH FOR GRINDING-MILLS.

Specification of Letters Patent. Patented N 11, 1919,

Application filed .Tune 4, 1918. Serial No. 238,093.

To all whom it may concern:

Be it known that I, EDWARD F. MoCooL, a citizen of the United States, residin at Victor, county of Teller, and State of 010- rado, have invented certain new and useful Improvements in Latches for Grinding- Mills; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

My invention relates generally speaking to improvements in grinding mills, but more specifically in means for locking a hollow grinding head or housing member of the structure in place, this housing member being hingedly connected with the frame work of the machineand adapted to swing outwardly whenever it may be necessary to gain access to the grinding structure within the hollow head or housing member.

My object is to provide a device adapted to securely lock the housing member in place upon the frame, the lock being operated by simply pushing the head into position, the device automatically assuming the interlocking relation under the force of the movement of the head. My further object is to provide a device of this-character of such construc tion that the hollow head or housing member may be quickly released and thrown to the open position.

An additional object of my improvement is to provide a locking device which shall be exceedingly simple and therefore, economical in construction.

Having briefly outlined my improvement I will proceed to describe the same in detail, reference being made to the accompanying drawing in which is illustrated an embodiment thereof.

In this drawing:

Figure 1 is a top plan view of the portion of an ore grinder with which my improved lock is adapted for use, the lock being shown in place with the housing member indicated by full lines in the open position and by dotted lines in the closed position.

Fig. 2 is an elevation of the lock shown on a much larger scale and looking in the direction of arrows 2, Fig. 1.

Fig. 3 is a section taken on the line 3-3, Fig. 2.

Fig. 4 is'a section taken on the line of the shaft 7 and cooperates with a second grinding member 9 (see dotted lines in Fig. 1), the latter being mounted Within a hollow head or housing 10 which is hingedly connected .with the frame, as shown at 12. When the hollow head or housing member 10 is in the closed position the two grinding members 8 and 9 cooperate.

Upon the housing 10 is mounted a lock 13 consisting of a leverlike device 14 which is pivotally connected, as shown at 15 with a lug 16 projecting from one side of the housing 10. The device 14 extends in both directions from the 'pivot 15, that is both toward the right and toward the left referring to Figs. 1, 2 and 3. The device 14 is hollowed out to receive the lug 16 of the housing, so that when the device is in the locked position the said lug would be practically concealed. The right hand portion 17 of the device 14 extends suficiently beyond the pivot to give the necessary leverage for unlocking the housing by pressing the said part inwardly to the position shown by dotted lines in Fig. 3, the device being normally held in the full line position by a torsionally acting spring 18 which is coiled around the pivot pin 14, one extremity 19 engaging the housing, while the opposite extremity 20 engages the part 17 considerably to the right of the pivot pin. The left hand portion of the device 14 extends beyond the lug 16 and is equipped with an antifrictional roller 21 which as the housing is moved from the full line position to the'dotted line position in Fig.1, first engages the curved face.

22 of a lateral projection 23 with which the I "frame work of the structure is provided.

, Under the influence of the momentum of the head, the roller 21 moves past thls projection and into engagement with the protruding extremity of a studQwith which the projection 23 is provided. In order to prevent the roller 21 from moving farther r inwardly than desired, I equip the device Y 1.4 with asetbolt 25 which'islthreaded into the saidjdevice and adapted to engage the w lug 16,;when the roller 2I is in engagement with the exposed end of the screw stud 24.

"The setbolt 25 when properly adjusted is V held insuch position by a lock nut 26. The r screw stud 24 is adjustable in the projection 23, its extremity adjacent the curved face'22'.

Qhavin'g a nick adapted toreceive a small screw driven The stud is devoid'of a head ,7 thusgiviiig-it 'a 'ra'nge' of adjustment equal to its full length, in. order to provide for 'possiblewear. Should one screw stud wear out another may besubstituted. A look nut 27 mounted on the protruding portion of the screwstud 'is emplo ed to lock it in the de sired position of adjustment. T

From the foregoing description, the use and operation of my improved locking device will be readilyunderstood. Assuming that the device is mounted upon the housing 10', as shown in Fig. 1,if the head isopen, as shown in full lines,"it will only be neces sary to swing the head into the closed posi-' tion' as outlined in dotted lines,'in order to cause the device 1% tointerlock vwith the screw stud 24, 'theset bolt 2'5 having first the dottedline position in Fig. v3, in which event the; roller 21 will'be disengaged from the screw stud 24, when the housing may be 'swung'tofthe full line position in Fig. 1, thus exposing the grinding members 8 and 9 and making it practicable to remove or repairtheir grindingffaces. 1 It is evident that it is important to securely lock the housing 10 in place in order to prevent the escape ofthe dust or pulverized material during the operationof the machine," the material to be'treated being fed into a chute or mouth 28; with which the housing member I .10v is provided, this mouthbeing located at i the top of the said member. and so arranged asto' guide the material into position to be "acted on by the grinding disks .8 and 9; 7

" l.,Thecombinationof a frame,'a housing 'hinge dly connected withthe frame, locking V V r Y mediate its eXtremities to-the housing, a spring carried by the pivot and acting onthe means comprising a device pivoted inter- V device onv one side of the pivot to throw, the

7 part: onthe opposite side toward the housing, the saidpart carrying a roller, fineans' carried by the frame and cooperating with the roller for locking purposes, and adjustable means carried by the said device for limiting the inward movement of its roller extremity.

2. The combination of a frame, a housing liingedly connected with the frame, locking means comprising a leverhke device pivoted intermediate its extremities to the housing,

a spring actingon the device on one side of thepivot to throw the part on the opposite side toward the frame, the said device carrying a roller at one extremity, adjustable means carried by theframe and coiiperating with the roller for locking purposes, and adjustable means carried by the said device for limiting the movement of its roller carrying extremity. i

3. The combination with a frame, of a housing hingedly connected therewith and the frame, thelast named arm carrying an antifrictional roller member, the frame having a ,curved projection cooperating with said'member to guide the device into locking relation with the frame.

5.'The combination of a frame, a hinged housing having a lateral projection, a leverlike device pivoted intermediate its extremities on said projection, a spring acting on one arm'of the devicetothrow the other arm toward the frame, the last named arm carrying a roller, a stud mounted in the frame and engaging the roller in looking relation, and a set bolt threaded in the device and engaging the housing lug to limit the movement of the device under the influence of the spring. 7

6; The combination of a frame, a hinged housing having a lug extending therefrom, a leverlike device pivoted intermediate its extremities on said lug, a torsional'ly acting spring mounted on the said pivot and acting on one arm of the device to'throw the other arm toward the frame, the last named arm carrying a roller, a stud threaded in the frame and adjustable to compensate for Wear, one extremity of said lug being arranged to tangentially engage the roller for locking purposes, and a set bolt threaded in the device and bearing, against the housing lug to limit the movement of the roller extremity of the device.

v 7. The combination with a frame of a jection cooperating with said engaging housing hinged thereto, a lever-like device means to guide the device into locking enpivoted intermediate its extremities to the gagement With the frame, and an adjustable 10 housing, a spring acting on one arm'to element on said projection to cooperate with 5 throw the other arm of the device toward the said roller for locking purposes.

frame, the last named arm carrying engag- In testimony whereof I affix my signature. ing means, the frame having a curved pro- EDWARD F. MOCOOL.

Copies of this patent may be obtained for five oents each, by addressing the Commissioner of Patents, Washington, D. G. 

